directory(3P)                                       directory(3P)



     NAME
          opendir, readdir, telldir, seekdir,  rewinddir,  closedir  -
          directory operations

     SYNOPSIS
          #include <sys/types.h>
          #include <direct.h>

          DIR *opendir(filename)
          char *filename;

          struct direct *readdir(dirp)
          DIR *dirp;

          void rewinddir(dirp)
          DIR *dirp;

          int closedir(dirp)
          DIR *dirp;

     DESCRIPTION
          opendir opens the directory named by filename and associates
          a directory stream with it.  opendir returns a pointer to be
          used to identify the directory stream in subsequent opera-
          tions.  The pointer NULL is returned if filename cannot be
          accessed, or if it cannot malloc(3) enough memory to hold
          the whole thing.

          readdir returns a pointer to the next directory entry.  It
          returns NULL upon reaching the end of the directory or
          detecting an invalid seekdir operation.

          The rewinddir macro resets the position of the named direc-
          tory stream to the beginning of the directory.  It also
          causes the directory stream to refer to the current state of
          the directory.

          closedir closes the named directory stream and frees the
          structure associated with the DIR pointer.

          Sample code which searchs a directory for entry name is:

          len = strlen(name);
          dirp = opendir(".");
          for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp))
              if (dp->d_namlen == len && !strcmp(dp->d_name, name)) {
                  closedir(dirp);
                  return FOUND;
          }
          closedir(dirp);
          return NOT_FOUND;




     April, 1990                                                     1

     directory(3P)                                       directory(3P)



          The result of using a directory stream after an exec(2) is
          undefined.  After a fork(2), either the parent of the child
          (but not both) may continue processing the directory stream
          using readdir and/or rewinddir.

     SEE ALSO
          ls(1), open(2), close(2), getdirentries(2), read(2),
          lseek(2), dir(4).















































     2                                                     April, 1990